The Grand Canyon in Arizona, USA – October 12th, 200936.1N 113.2W
The Grand Canyon is a steep-sided gorge carved by the Colorado River in the United States in the state of Arizona.
The canyon is 277 miles (446 km) long, ranges in width from 4 to 18 miles (6.4 to 29 km) and attains a depth of over a mile (1.83 km) (6000 feet).
It is largely contained within the Grand Canyon National Park, one of the first national parks in the United States. Here, the canyon snakes through the middle of the image, with Lake Mead visible on the left.
Longstanding scientific consensus has been that the canyon was created over a six million year period as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted.
The canyon began in the west, followed by another that formed in the east. Eventually, the two broke through and were merged some six million years ago. The close-ups focus on the eastern and western sections of the canyon.